package com.zhao.gulimall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zhao.common.utils.PageUtils;
import com.zhao.common.utils.Query;

import com.zhao.gulimall.product.dao.CategoryDao;
import com.zhao.gulimall.product.entity.CategoryEntity;
import com.zhao.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1、查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //2、组装成父子的树形结构

        //2.1）找到所有的一级分类
        List<CategoryEntity> level1Menus = entities.stream().filter(categoryEntity ->
            categoryEntity.getParentCid() == 0
            ).map((menu)->{
                menu.setChildren(getChildren(menu,entities));
                return menu;
        }).sorted((menu1,menu2)->{
            return menu1.getSort() - menu2.getSort();
        }).collect(Collectors.toList());
        return level1Menus;
    }
    //递归
    private List<CategoryEntity> getChildren(CategoryEntity root,List<CategoryEntity> all){

        List<CategoryEntity> children =  all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid().equals(root.getCatId());
        }).map(categoryEntity -> {
            categoryEntity.setChildren(getChildren(categoryEntity,all));
            return categoryEntity;
        }).sorted((menu1,menu2) -> {
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return children;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 1.检查当前删除的菜单，是否被其他地方引用

        //逻辑删除
        baseMapper.deleteBatchIds(asList);
    }
}
